Key of a switch



Aug. 31', 1926.

. B. ROSENBAUM v KEY OF A SWITCH Filed Augu'st'26. 1921 @1 INVENTOH WW BV a WWW. g E iT Torm/gm Patented Aug. 31, 1926.

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BRUNO ROSENBAUM, or BERLIN, GEnM'ANY, AssrGNoa {TO WEsgrr enousiii er -scenic & MANUFACTURING COMPANY, a con'ronarroN or PENNSYLVANIA.

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Application filed August 26, 1921, Serial No. 495,748, and 'in Germany September 8, 1916;

This invention relates to wave signaling systems, and has for its object the provision of means for enabling the reception of sig; nals whenever the transmission apparatus 5 is actually not in use and only at such times.

This feature enables the distant receiving operator to stop the transmitting operator at any time during the transmission of signals, as for repetition, thereby saving much valuable time, since the station transmitting is in a position to receive at each upstroke of the key.

In accordance with this invention, a sending key is provided with auxiliary switches and contacts actuated by suitable levers and links so as to perform the functions of the usual changeover or send-and-receive switch at each down and upstroke of the key. The lever and link mechanism is provided because of the necessity of breaking a comparatively heavy current at a high voltage with a quick separation of contacts by a distance of some m. m. and of preventing sparking across to the receiving contacts, while it is convenient for the hand-operated lever to be highly responsive and to move a distance of only some 3mm. By proper arrangement of these levers and contacts also a number of desirable operations may be performed such as: on the downstroke the receiver is dis connected from the ground and antenna, the detector is disconnected, the antenna is connected and primary power supplied to the transmitter; on the upstroke these operations are reversed, the transmitter being disconnected and the receiver connected in operative position. Finally, though the contacts should be closed firmly, the work necessary to perform these several functions must be very slight in order that the transmitting operator may not bcome fatigued.

My invention consists of the parts, com bination of parts and construction as hereinafter described and claimed having referr ence to the accompanying drawing, which shows the key in transmitting position.

In the key as shown a number of pairs of auxiliary contacts are provided which serve to make and break various circuits connected thereto. The antenna lead 31 may be connected to contact arm 6 which isof metal and thus the antenna may be transferred from the receiver, which is connected by lead o 9 m 7; 9 th transm tter wh ch is lit is further provided that the links and levers are so proportioned that upon operating the key handle 18 the arm 6 tends to move over a greater distance than is provided between contacts 7 and 14. A portion of rod 6 is therefore made of resilient material so as to allow the key handle to move after the arm 6 is at rest. This insures positive contact of arm 6 with contact 14 when-. ever the key is open.

The main power circuit includes the con tacts at 1 and this is closed when the key is depressed. The cont-acts 9 and 10 are in the receiver ground circuit and serve to disconnect the receiver from the ground when the key is depressed for transmission. Adjustable stops 13 and 25 serve to regulate the play of the lever 23.

The handle 18 is mounted on a long lever 17 connected by a resilient spring 34 to the support 20, so that the operator may enjoy the advantage of a long resilient lever rather than experience the difliculties of manipulating a key with a short lever such as 2.

In order to thoroly insulate the various circuits, knob 18, links 11 and 12 and supports 21, 22 and 23 are preferably of insulating material whereas levers 5 and 6 may be of metal. Adjustment of the key to establish the best operating position of the levers may be made by means of a head threaded on the link 11. In order to restore the levers to the receiving position when the key is released a compression spring 24 is arranged between support 28 and arm 4.

The operation of this key is as follows: When the hand knob 18 is pressed down as shown, lever 17 presses at 1, transmitting motion through levers 2, 3, 4, 5, 6 to contact 8, which moves from 7 to 14, thus transferring the antenna connection at 81 from the receiving lead 27 to the transmitter lead 26. At the same time the power supply is closed through contact 1 and leads 29 and 30; contacts 9 and 10 open, disconnecting the receiver from the ground 32, contacts at 1.3 disconnect the detector, and

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the contacts at 25 may short-circuit the released the operations take place in the reverse order and the transmitter is rene dered 1noperat1ve and the receiver 1s ren-- dered operative. V 7

It is to be understood that various changes in details of construction and arrangement of parts of the mechanism herein 3 1. In a signaling key, a manual lever,

a system of multiplying levers actuated thereby and constituting a compound lever, and electrical contacts actuated by three of said multiplying levers, whereby three different degrees of movement of the contacts When the key isare obtained by one movement of the manual lever.

2. In a signaling key, a plurality of multiplying levers, electrical contacts actuated by each lever, links connecting said levers into a compound lever, and means for adjusting thelength of one of said links to adjust the position of the other levers relative. thereto.

3. In a signaling key, a plurality of multiplying levers, electrical contacts actuated by each lever, links connecting said levers into a compound lever, a base, standards extending from said basein opposite direction and fulcrums in said standards supporting said levers, one of said links ex tending on both sides of said base.

In testimony whereof I aflix my signature;

, BRUNO ROSENBAUM. 

